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Bleeding air from the hydraulic components
NOTE: After bleeding air from the components, stop the
engine for five minutes and check there are no bubbles at
the surface of the hydraulic fluid in the reservoir.
Hydraulic pump
• Using a solvent, clean the periphery of the air bleed
plug. Loosen the air bleed plug, remove the plug if the
fluid does not flow.
• Fill the pump with new clean hydraulic fluid. Install and
tighten the air bleed plug.
• Start the engine and run it at low idle speed. Loosen
the air bleed plug on the pump. Tighten the plug when
air free fluid comes out of the bleed plug hole. Clean
the area completely.
Swing motor
• Start the engine and run it at low idle speed. Loosen
the drain port and make sure hydraulic fluid runs out. If
necessary, stop the engine and add oil via drain port.
Plug the drain port without tightening, then start the en-
gine and run it at low idle speed, leaving it to run until oil
begins to run from the orifice. Tighten the air bleed plug
completely. Swing the upperstructure at least twice
completely to the right and twice completely to the left.
• After complete bleeding, stop the engine for five min-
utes then check that there are no air bubbles in the hy-
draulic reservoir.
Attachment cylinders
• Start the engine and run it at low idle speed. Extend and
retract the attachment cylinder rods four or five times
without bringing them to end of stroke. Then repeat
the operation three or four times, this time bringing the
cylinder rods to end of stroke.
6 - MAINTENANCE
6-41
14
8B4G1U-005
15
K8R7P9-003A
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